That's more a tribute to your care with Web browsing and email reading than it is to the gateway. I insist on a gateway router for every client who has broadband (all of them) telling them it's a cheap and extremely effective defense against the fastest spreading attacks.

Alas, many attacks presume the gateway and work from the inside. Against these the gateway is like using a condom to prevent bird flu.

Nothing is as effective as a careful user, but we can't get that.